Henry Beecher Dierdorff was an American inventor in the field of mining.
Henry Beecher Dierdorff was an inventor of mining equipment, most notable for the first successful application of electricity to power mining equipment under the surface of earth.
While an engineer with Jeffery Mining and Manufacturing Company of Columbus, Ohio, Dierdorff developed insulation that could be packed around electric motor housings to suppress sparking found on early electrical motors. This technology allowed the first safe electric seam cutting tool in underground mining. This tool was capable of cutting anthracite coal and was known as the Congo Coal Cutter after its success for the Congo Mining Company, of Corning, Ohio.
Between 1885 and 1909, Dierdorff designed and secured thirty-five patents from the United States Patent Office related to mining and mining safety. One his most widely used patents involved the development of power systems to deliver electricity to miners underground result in the first safe delivery of electric light to miners working underground.
At the time of his retirement from Jeffery, Dierdorff oversaw the company's entire manufacturing facilities and processes.